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Re: Why do some instruments transpose?
In addition to WWindy's reasoning this also allows players to pick up a differently transposed instrument in the same family and play it the same. For example: a written F is fingered the same for Bari, tenor, Alto, etc. members of the saxophone family. This means once you learn one instrument in a family you can already play the rest the same (with slight changes in air and embouchure). If this weren't the case, then switching between different members of an instrumental family would be considerably more difficult - you would basically have to learn new fingerings for every instrument.